active relocking device
  n.
   a device that places its bolts every time a safe door is closed and activation via attack prevents it from retracting its bolts

Locksmith dictionary . 2014.

Look at other dictionaries:

  • external relocking device —   n.    a device outside the lock case that prevents the safe door from being opened after attack, two types are typically used, active and passive …   Locksmith dictionary

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